Looking for a high powered ignition system? These coils are designed to put out 103 mJ per spark, with a longer spark duration (2.9 ms) than what you’d see with a capacitive discharge. They are the same coils used in the Huber Mustang, which makes over 250 hp per cylinder, as well as on our own Miata project car. A 19 amp IGBT ignitor is built in. They can be driven with a 5 volt logic level output – an MS3X or MS3-Pro will run them directly (set spark output to going high), and we recommend a 270 to 330 ohm pullup if you’re building a MegaSquirt 1 or 2 to drive them, and they can fully charge with as low as 2.5 ms of dwell. Normally, you’d use them for a distributorless ignition as a coil per plug application. They can be fired sequentially or every crank revolution (wasted spark coil per plug). If used as a single coil with a distributor you may need to run a bit less dwell to prevent heat buildup from being an issue. Maximum recommended duty cycle is 40%.
The connector is not included, they can be ordered separately here.
Here is the connector pinout:
A – Ignition signal from ECU
B – Logic ground, connect to ECU ground
C – Spark wire ground, connect to cylinder head
D – Power ground, connect to battery negative
E – 12 volt power
The coil dwell starts when a 5 volt signal is applied to pin A, and the coil fires when the voltage drops to zero. The signal is similar to an LSx coil, although it does need a bit more current to trigger than the LSx coils.
Minimum voltage output (no load, at recommended dwell): 40,000 volts
Output energy: 103 mJ
Spark duration: 2.9 ms
Primary resistance: 0.5 ohms (not directly measurable)
Primary inductance: 4.8 mH (not directly measurable)
Secondary resistance: 8,500 ohms
Secondary inductance: 22.5 H
Turns ratio: 71.1
Maximum current: 19 amps
Maximum battery voltage: 17 volts
Nominal dwell: 3.0 ms
These are very solid, robust coils that will do well for you if dwell is set up correctly. However, they can be killed by excessive dwell or duty cycle. As they are race coils, the manufacturer does not provide a warranty.